Rotary water-meter



(No Model.)

, J. A. TILDEN. ROTARY WATER METER.

Patented Mar. 11, 1890).

Wifinaswea:

UNITED STATES PATENT OFFICE.

JAMES A. TILDEN, OF HYDE PARK, MASSACHUSETTS.

ROTARY WATER-M ETER.

SPECIFICATION forming part of Letters Patent No. 423,289, dated March11, 1890. Application filed July 28, 1887. Serial No. 24:5,4'72' (Nomodel.)

To all whom it may concern.-

Be it known that 1, Laws A. TILDEN, of Hyde Park, in the county ofNorfolk and State of Massachusetts, a citizen of the United States, haveinvented a new and useful Improvement in Fluid-Meters, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, forming a part of this specification, inexplaining its nature.

The invention is an improvement upon that described in my LettersPatent, Reissue No. 10,778, dated November 2, 1886, original No. 3%,503,dated August 18, 1885. In the said patent I have described a fluid-meterhaving a stationary wall provided with measuring, spaces or recessesopening from a pistonchamber, the ends of the chamber being closed byfixed parallel heads, a movable piston of less diameter than that of thechamber accurately fitted between said heads, and having lobes andprojections equal in number to the measuringspaces, and each lobe movingin and conforming to the spaces, and an inletport for supplying to eachmeasuring-space fluid under pressure, andoutlet-ports at each end of thepiston, extending from each measuring-spaoe to an escapapassage, wherebythe piston is balanced in its function as a fluidactuating valve. I11the present invention, instead of the stationary piston-chamber wall anda movable piston, I employ a stationary piston and a movable wall havingmeasuring spaces or recesses formed in it and movable therewith. Thepiston and the wall have the same shape as like parts described in mysaid patent.

The invention varies from that described in my said patent in such otherrespects as are necessary, owing to the change of movement from thepiston to the wall. Each movable measuring space or recess has an inlotand an outlet for the admission and escape of fluid under pressure, andthe Wall is balanced as far as practicable, the end press ure caused bythe escape of fluid through the escape-ports being balanced by endpressure upon the opposite end of the wall pro vided by ports ordepressions formed in the upper head or plate.

In the drawings, Figure 1 is a view in plan of the lower portion of themeter-case and in horizontal section of the stationary piston andmovable wall. Fig. 2 is a view principallyi vertical central section. I

Referring to the drawings, A represents the lower section of themeter-case, and A the upper section thereof. The lower section has theinlet-passage a, the distributing-chamber ct, and the outlet-chamber aand outletpassage a It has also the chamber B, which is separated fromthe distributing-chamber a and outlet-chamber a by the metal plate b,cast with the case, and in which the inlet and a portion of the outletports are formed. This chamber B contains the movable wall 0 and thestationary piston D. The stationary piston D has the lobes orprojections cl, and is secured with the plate cl to the plate I) bymeans of screws or bolts 1), so that the plate 61' and the piston areheld stationary. \Vith this exception-that is, with the exception thatit is stationaryit is like the piston described in' my said patent. Thewall 0 has the inwardly-extending projections c and the measuring spacesor recesses c, and this wall is in every respect like that described inmy said patent, excepting that it is movable, so that its measuringspaces or recesses are caused. to be moved relatively to the lobes d ofthe piston in exactly the same way that the lobes of the pistondescribed in my said patent are moved in relation to the measuring;spaces or recesses of the stationary wall of the invention thereinspecified. This movement of the wall is not a rotary move ment overevery part thereof upon a fixed center-like, for instance, that of awheel-but is a movement which, while the wall itself does not rotate,causes each part thereof to describe a rotary movement in a small space,and causes its measuring space or recess to describe a rotary movementin regard to each respective lobe of the piston. There must, of course,be sufficient space outside of the movable wall and in the chamber B topermit this movement of the wall to take place, and the plate (1'extends sufficiently to form a cover to the movable measuring spaces orrecesses.

E represents the various i11let-ports--aseparate inlet-port for eachmeasuring space or recess.

F represents the n1tlet-ports, there being separate outlet-ports foreach measuring space or recess. The ports are like those described in mysaid patent, and are opened and closed by the movable wall, and theescaping fluid must exert end pressure thereon, which would tend to movethe wall forcibly against the stationary head or plate cl, and I haveformed in the stationary plate (1 ports or depressions F, which portspermit fluid under pressure to bear against the reverse or opposite endof the piston, and thus counteractv the effect of the pressure of thefluid passing through the ports.

To communicate the movement of the piston to the register, I have formedin the case two chambers or recesses G- G, which are oppositelyarranged, and I have attached to the movable wall the rod g, the rodbeing bent at each end and returned to permit the proper movement of thewall in relation to the head 61'. The rod has a stud or pin g,'\vhichforms connection with the arm or lever g attached'to the shaft of theregistering mechanism, and communicates a rotary movement thereto.

The chamber B outside the movable wall I dischar es water through theholes h from wall O is caused to be moved by the pressure of the fluidthereon relatively to the stationary piston in the same manner and forthe same reasons that the piston is caused to describe its movement inrelation to the stationary wall mentioned in said patent.

Having thus fully described my invention, I claim and desire to secureby Letters Patent of the United States 1. The combination, in a meter,of the case A, having the recesses G G, the stationary piston D, havingthe lobes d, the movable wall 0, having measuring spaces or recesses c,the inlet and exhaust ports, the registering mechanism, and the bent rodg, attached to the piston-wall, extending into the recesses G G, andcommunicating the movement of the piston-wall to the registeringmechanism, substantially as described.

'2. In a fluid-meter, the stationary piston or block having lobes (Z, amovable wall having measuring spaces or recesses c, andoppositely-arranged ports in the heads or plates Z) Z), arranged toconduct fluid-pressure to both ends of the movable wall, as and for thepurposes specified.

JAMES A. TILDEN.

\Vitncsses:

WM. J. SMITH, HENRY D. WrNToN.

